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8th Grade - Reaction
Review of Reactions in Chemistry
Question | Answer |
---|---|
Chemical Reaction | Occurs when one or more substances change to form new substances |
Reactants | The substances that change in a chemical reaction |
Products | The substances that are the result of the change in the chemical reaction |
Evidence that a chemical change has occurred | Formation of precipitate, temperature change, color change, or formation of gas |
Endothermic | A chemical reaction that occurs when heat is absorbed or taken in |
Exothermic | A chemical reaction that occurs when heat energy is released |
Law of Conservation of Mass | Matter can neither be created nor destroyed, it can only change form |
Chemical Equation | A way of writing the changes that occur during a chemical reaction |
In order for a chemical reaction to be balanced, these must be equal | The atoms of the reactant and the atoms of the product |